Container blank



FIG. 1 is a top view of a container blank embodying our new design, the bottom view being a mirror image thereof;

FIG. 2 is an elevational front view thereof;

FIG. 3 is an elevational back view thereof; and,

FIG. 4 is an elevational left side view, the right side view being a mirror image thereof. 

The ornamental design for a container blank, as shown and described. 